All that makes her a little TOO perfect for me 
But she's lazy and in blonde-mode rarely puts effort into anything and kind of takes it for granted that she will be top idol.

I personally feel Miki never crosses the line from "cute-lazy" to "annoying-useless-lazy", but I think some people might have that kind of reaction.
She also breaks so many guys' hearts! I know she doesn't really have any choice because so many confess to her, but nevertheless that kind of outcome is reprehensible, maybe she could just let it be known that she's focusing on her career/idol ambitions at the moment and not interested in a relationship and make sure it's a decisive and conclusive non-negotiable way in which it is expressed? Instead she seems to just knock them down one after another.

Also, like any other sheltered person, her blonde-mode is not likely to be wise, mature, or well-grounded, in other words, that seems to me at least to be a huge part of being "too perfect" is something like having all the answers! And that's definitely not Miki!

I don't feel like Miki is an unrealistic girl, there's probably a handful of girls like her in the real world. Literally. You could probably count them on one hand, but they almost certainly do exist. (Allmyjealousyandrage@theirfuturehusbands

) They're the kind of girls that who merit no less than the most honorable, devoted, capable, intelligent, and wealthiest of Kings, or a commoner who surpasses the material worth of nobility or governance by being a living paragon of the finest heart and noblest soul.
Actually I can't say I'm aware of any person living on this world at the moment who fulfills such a standard. Unfortunately the wonderful Miki's of the world will have to settle for less. Unless they marry one another. And have perfect children by laboratory gene-combination which allows same-sex couples to have kin children. Which would be Godly.

Miki married to Miki!

Anyway, that's just my take on it. I can't think of any other reasons at the moment why Miki would be unlikeable in any way.
I also just realized I'm like Idol_Hearts, but about Haruka, I'm not too sure why she's so top-tier popular, although the forumers here provided some solid reasoning for her strong popularity... but almost #1? With Iori, Yayoi, Chihaya, Makoto and Azusa in the same contest? ... No me comprende
